“Their very names are evocative: Font-de-Gaume, Lascaux, Altamira, Les Combarelles, particularly if you have had the good fortune to visit one or two of them.

These are the caves, mostly in northern Spain and southern France – some 350 of them are now known – in which prehistoric art, paintings and engravings, have been discovered. That means works of art that are up to 32,000 years old.”